/Engine/Source/Runtime/Engine/Classes/VT/LightmapVirtualTexture.h
class ULightMapVirtualTexture2D : public [UTexture2D](API\Runtime\Engine\Engine\UTexture2D)
bool
bPreviewLightmap
Whether this virtual texture is used for preview lightmaps (no underlyingFVirtualTexture2DResource)
TArray< int8 >
TypeToLayer